The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information.
Note: This will cause you to lose any Extensions, Open websites, and some Preferences.

To Reset Firefox do the following:

Go to Firefox > Help > Troubleshooting Information.

Click the "Reset Firefox" button.

Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.

Thank you. This seems to have fixed the issue. A bit of a pain to get my add-ons going again, but definitely worth it in the frustration realm. Now, if I could just get the pin app tabs working when my browser is re-opened I'd be thrilled.
Thank you again!!